Distribution spatiale de la porosité des matériaux cimentaires

ABSTRACT Degradation of cementitious matrix in aggressive aqueous environments among others is accompanied by modifications of the spatial distribution of connected porosity. The application of the 14C or 3H-PMMA (polyméthylmethacrylate) impregnation method gives a quantitative and multi-scale representation of this distribution. The first application concerns a mortar, allowing to visualise and to quantify the in situ cement porosity. The second application is related to a cement paste degraded by organic acids. This tool has many potential applications in the field of cementitious materials. It allows a sharp characterisation of internal porosity variations frequently found during durability studies, and furthermore, it provides a realistic geometrical representation of pore space that can be used for solute transfer modelling.